Polaris505 0 Posted September 2, 2019 Share Posted September 2, 2019 Will my 2018 Spark LT get better gas mileage with 89 gas? Link to post Share on other sites
Bobby MSME 100 Posted September 2, 2019 Share Posted September 2, 2019 (edited) Short answer is NO. But your wallet will feel a bit lighter. Now if you increased compression in the cylinders, it could help reduce knocking & pinging. Edited September 2, 2019 by Bobby MSME Link to post Share on other sites
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